International Commission on Zoological Nomenclature. Direction 43 Addition to the Official List of Specific Names in Zoology (a) of the specific names of the type species of seventy three genera in the class Aves, the names of which were placed on the Official List of Generic Names in Zoology in the period up to the end of 1936 and (B) of twelve specific names which are currently regarded as senior Subjective synonyms of such names.Opinions and declarations rendered by the International Commission on Zoological Nomenclature 1D(D.7), 171-210 (1956)